2001132453 has 4 divisors (see below), whose sum is σ = 2668176608. Its totient is φ = 1334088300.

The previous prime is 2001132437. The next prime is 2001132467. The reversal of 2001132453 is 3542311002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2001132453 - 2⁴ = 2001132437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001134453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333522073 + ... + 333522078.

It is an arithmetic number, because the mean of its divisors is an integer number (667044152).

Almost surely, 2^2001132453 is an apocalyptic number.

It is an amenable number.

2001132453 is a deficient number, since it is larger than the sum of its proper divisors (667044155).

2001132453 is an equidigital number, since it uses as much as digits as its factorization.

2001132453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667044154.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 2001132453 is about 44734.0189676716. The cubic root of 2001132453 is about 1260.1588052548.

Adding to 2001132453 its reverse (3542311002), we get a palindrome (5543443455).

It can be divided in two parts, 200113 and 2453, that added together give a triangular number (202566 = T₆₃₆).

The spelling of 2001132453 in words is "two billion, one million, one hundred thirty-two thousand, four hundred fifty-three".